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    SubjectRe: Asynchronous IO

    On Fri, Apr 13, 2001 at 04:45:07AM -0400, Dan Maas wrote:
    > IIRC the problem with implementing asynchronous *disk* I/O in Linux today is
    > that the filesystem code assumes synchronous I/O operations that block the
    > whole process/thread. So implementing "real" asynch I/O (without the
    > overhead of creating a process context for each operation) would require
    > re-writing the filesystems as non-blocking state machines. Last I heard this
    > was a long-term goal, but nobody's done the work yet

    SGI and Ben LaHaise both have kernel async IO functionality working,
    and Ingo Molnar's Tux code has support for doing certain filesystem
    lookup operations asynchronously too.

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